Node.js v22.8.0 文档

基于进程的权限#

¥Process-based permissions

权限模型#

¥Permission Model

Node.js 权限模型是一种在执行期间限制对特定资源的访问的机制。API 存在于标志 --experimental-permission 之后，启用后将限制对所有可用权限的访问。

¥The Node.js Permission Model is a mechanism for restricting access to specific resources during execution. The API exists behind a flag --experimental-permission which when enabled, will restrict access to all available permissions.

可用权限由 --experimental-permission 标志记录。

¥The available permissions are documented by the --experimental-permission flag.

使用 --experimental-permission 启动 Node.js 时，通过 fs 模块访问文件系统、生成进程、使用 node:worker_threads、使用原生插件、使用 WASI 和启用运行时检查器的能力将受到限制。

¥When starting Node.js with --experimental-permission, the ability to access the file system through the fs module, spawn processes, use node:worker_threads, use native addons, use WASI, and enable the runtime inspector will be restricted.

$ node --experimental-permission index.js
node:internal/modules/cjs/loader:171
  const result = internalModuleStat(filename);
                 ^

Error: Access to this API has been restricted
    at stat (node:internal/modules/cjs/loader:171:18)
    at Module._findPath (node:internal/modules/cjs/loader:627:16)
    at resolveMainPath (node:internal/modules/run_main:19:25)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:24)
    at node:internal/main/run_main_module:23:47 {
  code: 'ERR_ACCESS_DENIED',
  permission: 'FileSystemRead',
  resource: '/home/user/index.js'
} 拷贝

允许访问生成进程和创建工作线程可以分别使用 --allow-child-process 和 --allow-worker 来完成。

¥Allowing access to spawning a process and creating worker threads can be done using the --allow-child-process and --allow-worker respectively.

要在使用权限模型时允许原生插件，请使用 --allow-addons 标志。对于 WASI，请使用 --allow-wasi 标志。

¥To allow native addons when using permission model, use the --allow-addons flag. For WASI, use the --allow-wasi flag.

运行时 API#

¥Runtime API

通过 --experimental-permission 标志启用权限模型时，新属性 permission 将添加到 process 对象。此属性包含一个功能：

¥When enabling the Permission Model through the --experimental-permission flag a new property permission is added to the process object. This property contains one function:

permission.has(scope[, reference])#

在运行时检查权限的 API 调用 (permission.has())

¥API call to check permissions at runtime (permission.has())

process.permission.has('fs.write'); // true
process.permission.has('fs.write', '/home/rafaelgss/protected-folder'); // true

process.permission.has('fs.read'); // true
process.permission.has('fs.read', '/home/rafaelgss/protected-folder'); // false 拷贝

文件系统权限#

¥File System Permissions

默认情况下，权限模型通过 node:fs 模块限制对文件系统的访问。它不能保证用户无法通过其他方式（例如通过 node:sqlite 模块）访问文件系统。

¥The Permission Model, by default, restricts access to the file system through the node:fs module. It does not guarantee that users will not be able to access the file system through other means, such as through the node:sqlite module.

要允许访问文件系统，请使用 --allow-fs-read 和 --allow-fs-write 标志：

¥To allow access to the file system, use the --allow-fs-read and --allow-fs-write flags:

$ node --experimental-permission --allow-fs-read=* --allow-fs-write=* index.js
Hello world!
(node:19836) ExperimentalWarning: Permission is an experimental feature
(Use `node --trace-warnings ...` to show where the warning was created) 拷贝

两个标志的有效参数是：

¥The valid arguments for both flags are:

• * - 分别允许所有 FileSystemRead 或 FileSystemWrite 操作。

  ¥* - To allow all FileSystemRead or FileSystemWrite operations, respectively.

• 以逗号 (,) 分隔的路径分别仅允许匹配 FileSystemRead 或 FileSystemWrite 操作。

  ¥Paths delimited by comma (,) to allow only matching FileSystemRead or FileSystemWrite operations, respectively.

示例：

¥Example:

• --allow-fs-read=* - 它将允许所有 FileSystemRead 操作。

  ¥--allow-fs-read=* - It will allow all FileSystemRead operations.

• --allow-fs-write=* - 它将允许所有 FileSystemWrite 操作。

  ¥--allow-fs-write=* - It will allow all FileSystemWrite operations.

• --allow-fs-write=/tmp/ - 它将允许 FileSystemWrite 访问 /tmp/ 文件夹。

  ¥--allow-fs-write=/tmp/ - It will allow FileSystemWrite access to the /tmp/ folder.

• --allow-fs-read=/tmp/ --allow-fs-read=/home/.gitignore - 它允许 FileSystemRead 访问 /tmp/ 文件夹和 /home/.gitignore 路径。

  ¥--allow-fs-read=/tmp/ --allow-fs-read=/home/.gitignore - It allows FileSystemRead access to the /tmp/ folder and the /home/.gitignore path.

也支持通配符：

¥Wildcards are supported too:

• --allow-fs-read=/home/test* 将允许读取与通配符匹配的所有内容。例如：/home/test/file1 或 /home/test2

  ¥--allow-fs-read=/home/test* will allow read access to everything that matches the wildcard. e.g: /home/test/file1 or /home/test2

传递通配符 (*) 后，所有后续字符都将被忽略。例如：/home/*.js 的工作方式与 /home/* 类似。

¥After passing a wildcard character (*) all subsequent characters will be ignored. For example: /home/*.js will work similar to /home/*.

初始化权限模型时，如果指定的目录存在，它将自动添加通配符 (*)。例如，如果 /home/test/files 存在，它将被视为 /home/test/files/*。但是，如果目录不存在，则不会添加通配符，并且访问将仅限于 /home/test/files。如果要允许访问尚不存在的文件夹，请确保明确包含通配符：/my-path/folder-do-not-exist/*。

¥When the permission model is initialized, it will automatically add a wildcard (*) if the specified directory exists. For example, if /home/test/files exists, it will be treated as /home/test/files/*. However, if the directory does not exist, the wildcard will not be added, and access will be limited to /home/test/files. If you want to allow access to a folder that does not exist yet, make sure to explicitly include the wildcard: /my-path/folder-do-not-exist/*.

权限模型约束#

¥Permission Model constraints

在使用此系统之前，你需要了解一些限制条件：

¥There are constraints you need to know before using this system:

• 该模型不会继承到子节点进程或工作线程。

  ¥The model does not inherit to a child node process or a worker thread.

• 使用权限模型时，以下功能将受到限制：

  ¥When using the Permission Model the following features will be restricted:

  • 原生模块

    ¥Native modules

  • 子进程

    ¥Child process

  • 工作线程

    ¥Worker Threads

  • 检查器协议

    ¥Inspector protocol

  • 文件系统访问

    ¥File system access

  • WASI

• 权限模型是在 Node.js 环境搭建完成后初始化的。但是，某些标志（例如 --env-file 或 --openssl-config）被设计为在环境初始化之前读取文件。因此，此类标志不受权限模型规则的约束。这同样适用于可以通过 v8.setFlagsFromString 在运行时设置的 V8 标志。

  ¥The Permission Model is initialized after the Node.js environment is set up. However, certain flags such as --env-file or --openssl-config are designed to read files before environment initialization. As a result, such flags are not subject to the rules of the Permission Model. The same applies for V8 flags that can be set via runtime through v8.setFlagsFromString.

• 当启用权限模型时，无法在运行时请求 OpenSSL 引擎，从而影响内置的 crypto、https 和 tls 模块。

  ¥OpenSSL engines cannot be requested at runtime when the Permission Model is enabled, affecting the built-in crypto, https, and tls modules.

• 通过 node:fs 模块使用现有文件描述符会绕过权限模型。

  ¥Using existing file descriptors via the node:fs module bypasses the Permission Model.

限制和已知问题#

¥Limitations and Known Issues

• 符号链接甚至会被跟踪到已授予访问权限的路径集之外的位置。相对符号链接可以允许访问任意文件和目录。在启用权限模型的情况下启动应用时，必须确保已授予访问权限的路径不包含相对符号链接。

  ¥Symbolic links will be followed even to locations outside of the set of paths that access has been granted to. Relative symbolic links may allow access to arbitrary files and directories. When starting applications with the permission model enabled, you must ensure that no paths to which access has been granted contain relative symbolic links.